A method for vanadium-containing stone coal decarburization-crystal breaking roasting enhanced acid leaching vanadium extraction

An acid leaching and decarbonization technology, applied in the field of vanadium extraction from stone coal, can solve the problems of poor oxidation uniformity of the inner and outer layers of the pellets, easy under-burning or over-burning of the rotary kiln, low energy utilization rate of bituminous coal, etc., and achieve gas-solid reaction High efficiency, improved effect and stability, improved oxidation effect

Active Publication Date: 2021-06-15
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

As an important vanadium-containing resource, stone coal has huge reserves. Due to the complex and changeable mineral composition in stone coal, the occurrence states of vanadium in stone coal are different, which has also led to the fact that vanadium-containing stone coal has not yet Efficient utilization; therefore, how to realize the effective extraction of vanadium resources in stone coal is of great significance to alleviate the shortage of vanadium resources in my country
[0003] Patent CN 103952538 A relates to a roasting method for stone coal vanadium ore raising material, adjusting air and supplementing heat. It is proposed to add material raising, air supplementing and heat supplementing devices to the conventional rotary kiln to improve the roasting effect of stone coal, but the rotary kiln still exists Disadvantages such as easy under-burning or over-burning, low energy utilization rate and need to mix bituminous coal
Patent CN 103276195 A relates to a shaft furnace roasting method and system for stone coal and vanadium ore. It is proposed to mix vanadium-containing stone coal and sodium peroxide into the shaft furnace for roasting, which can achieve the oxidation effect to a certain extent, but there are still balls Disadvantages such as poor oxidation uniformity of the inner and outer layers of the pellet, sulfur pollution in the tail gas, etc.
Patent CN 106282538 A relates to a method for preparing high-purity vanadium pentoxide by one-step method from stone coal. Fluidized fluidized furnace can optimize the roasting effect to a certain extent and improve the conversion rate of vanadium, but it needs to adopt the roasting method of intermittent feeding and gradual heating. There are disadvantages such as small processing capacity and difficulty in industrial application

Method used

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  • A method for vanadium-containing stone coal decarburization-crystal breaking roasting enhanced acid leaching vanadium extraction
  • A method for vanadium-containing stone coal decarburization-crystal breaking roasting enhanced acid leaching vanadium extraction
  • A method for vanadium-containing stone coal decarburization-crystal breaking roasting enhanced acid leaching vanadium extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Process such as figure 1 shown;

[0043] The vanadium-containing stone coal block contains V by mass percentage 2 o 5 1.21%, C 11.87%, TFe 2.69%, SiO 258.33%; crush the vanadium-containing stone coal block with a particle size of 10-200mm to 2-10mm to make stone coal ore particles; grind the stone coal ore particles to -0.074mm with a mass content of 60% to make stone coal ore powder ;

[0044] A suspension roasting device with a combustion station at the bottom and an induced draft fan on the top is adopted; when the induced draft fan is turned on, air and gas are introduced into the combustion station for combustion to generate hot flue gas, which then enters the suspension roasting device; at the same time, the stone coal mine The powder is transported to the suspension roasting device, and the stone coal ore powder enters from the upper part of the suspension roasting device; the stone coal ore powder is in a suspended state under negative pressure under the ac...

Embodiment 2

[0049] Method is with embodiment 1, and difference is:

[0050] (1) Vanadium-containing stone coal blocks contain V by mass percentage 2 o 5 0.95%, C 17.17%, TFe 6.51%, SiO 2 52.13%; the mass content of the part that grinds stone coal ore particles to -0.074mm is 80%;

[0051] (2) Stone coal powder is roasted at 800°C with heat storage; the residence time of stone coal powder in the suspension roasting device is 60s;

[0052] (3) The regenerative stone coal powder is decarburized and roasted at a temperature of 600°C, and the residence time in the decarburized roasting device is 26 minutes;

[0053] (4) In the mixed gas introduced in the crystal-breaking roasting device, the volume ratio of air and nitrogen is 2.5, the temperature of the decarburized material is controlled at 800°C, and the residence time of the decarburized material in the crystal-breaking roasting device is 50min;

[0054] (5) When acid leaching, the mass concentration of sulfuric acid solution is 30%, ...

Embodiment 3

[0056] Method is with embodiment 1, and difference is:

[0057] (1) Vanadium-containing stone coal blocks contain V by mass percentage 2 o 5 1.1%, C 13.2%, TFe 3.4%, SiO 2 54.6%; the mass content of the part that grinds stone coal ore particles to -0.038mm is 90% to make stone coal ore powder;

[0058] (2) Thermal storage roasting of stone coal powder at 850°C; the residence time of stone coal powder in the suspension roasting device is 40s;

[0059] (3) The regenerative stone coal powder is decarburized and roasted at a temperature of 850°C, and the residence time in the decarburized roasting device is 22 minutes;

[0060] (4) In the mixed gas introduced in the crystal-breaking roasting device, the volume ratio of air and nitrogen is 2.5, the temperature of the decarburized material is controlled at 850°C, and the residence time of the decarburized material in the crystal-breaking roasting device is 40min;

[0061] (5) When acid leaching, the mass concentration of sulfur...

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Abstract

A method for vanadium-containing stone coal decarburization-crystal-breaking roasting enhanced acid leaching vanadium extraction, which is carried out as follows: (1) crushing and grinding the vanadium-containing stone coal block to make stone coal ore powder; (2) hot flue gas Pass into the suspension roasting device; the coal powder is transported to the suspension roasting device, suspended by the high-temperature air flow, and discharged after heat storage and roasting at 700-900 °C; (3) transported to the decarbonization roasting device, and air is introduced to make the heat storage stone coal powder Suspended, decarburized and roasted at 500-800°C, and the decarbonized material is discharged; (4) Air and nitrogen mixed gas is introduced into the crystal-breaking roasting device, and the decarburized material is transported to the crystal-breaking roasting device for suspension, and oxidized at 750-900 °C, Discharge of crystal-breaking and roasting materials; (5) Carry out acid leaching in sulfuric acid solution to extract vanadium. The invention has the advantages of simple technological process, uniform product properties, large equipment processing capacity, high efficiency, energy saving and environmental protection, and easy realization of large-scale.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction from stone coal. Specifically, it relates to a method for vanadium-containing stone coal decarburization-crystal-breaking roasting and enhanced acid leaching for vanadium extraction. Background technique [0002] As an important strategic substance, vanadium is widely used in various industries. With the development of iron and steel industry, the consumption of vanadium as an important additive continues to increase, which makes vanadium resources increasingly tight. As an important vanadium-containing resource, stone coal has huge reserves. Due to the complex and changeable mineral composition in stone coal, the occurrence states of vanadium in stone coal are different, which has also led to the fact that vanadium-containing stone coal has not yet Efficient utilization; therefore, how to realize the effective extraction of vanadium resources in stone coal is of great significance to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B1/10C22B1/02C22B3/08
CPCC22B1/02C22B1/10C22B3/08C22B34/22Y02P10/20
Inventor 袁帅李艳军白哲韩跃新高鹏孙永升
Owner NORTHEASTERN UNIV LIAONING
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